WTF::notFound looks too much like a local variable.

Source/core/css/StyleSheetContents.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 463 matching lines @@
 
 void StyleSheetContents::registerClient(CSSStyleSheet* sheet)
 {
     ASSERT(!m_clients.contains(sheet));
     m_clients.append(sheet);
 }
 
 void StyleSheetContents::unregisterClient(CSSStyleSheet* sheet)
 {
     size_t position = m_clients.find(sheet);
-    ASSERT(position != notFound);
+    ASSERT(position != kNotFound);
     m_clients.remove(position);
 }
 
 void StyleSheetContents::addedToMemoryCache()
 {
     ASSERT(!m_isInMemoryCache);
     ASSERT(isCacheable());
     m_isInMemoryCache = true;
 }
 
 void StyleSheetContents::removedFromMemoryCache()
 {
     ASSERT(m_isInMemoryCache);
     ASSERT(isCacheable());
     m_isInMemoryCache = false;
 }
 
 void StyleSheetContents::shrinkToFit()
 {
     m_importRules.shrinkToFit();
     m_childRules.shrinkToFit();
 }
 
 }